diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/src/fonts/SkGScalerContext.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/gfx/skia/trunk/src/fonts/SkGScalerContext.cpp Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,265 @@ +/* + * Copyright 2013 Google Inc. + * + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "SkGScalerContext.h" +#include "SkGlyph.h" +#include "SkPath.h" +#include "SkCanvas.h" + +class SkGScalerContext : public SkScalerContext { +public: + SkGScalerContext(SkGTypeface*, const SkDescriptor*); + virtual ~SkGScalerContext(); + +protected: + virtual unsigned generateGlyphCount() SK_OVERRIDE; + virtual uint16_t generateCharToGlyph(SkUnichar) SK_OVERRIDE; + virtual void generateAdvance(SkGlyph*) SK_OVERRIDE; + virtual void generateMetrics(SkGlyph*) SK_OVERRIDE; + virtual void generateImage(const SkGlyph&) SK_OVERRIDE; + virtual void generatePath(const SkGlyph&, SkPath*) SK_OVERRIDE; + virtual void generateFontMetrics(SkPaint::FontMetrics* mX, + SkPaint::FontMetrics* mY) SK_OVERRIDE; + +private: + SkGTypeface* fFace; + SkScalerContext* fProxy; + SkMatrix fMatrix; +}; + +#define STD_SIZE 1 + +#include "SkDescriptor.h" + +SkGScalerContext::SkGScalerContext(SkGTypeface* face, const SkDescriptor* desc) + : SkScalerContext(face, desc) + , fFace(face) +{ + + size_t descSize = SkDescriptor::ComputeOverhead(1) + sizeof(SkScalerContext::Rec); + SkAutoDescriptor ad(descSize); + SkDescriptor* newDesc = ad.getDesc(); + + newDesc->init(); + void* entry = newDesc->addEntry(kRec_SkDescriptorTag, + sizeof(SkScalerContext::Rec), &fRec); + { + SkScalerContext::Rec* rec = (SkScalerContext::Rec*)entry; + rec->fTextSize = STD_SIZE; + rec->fPreScaleX = SK_Scalar1; + rec->fPreSkewX = 0; + rec->fPost2x2[0][0] = rec->fPost2x2[1][1] = SK_Scalar1; + rec->fPost2x2[1][0] = rec->fPost2x2[0][1] = 0; + } + SkASSERT(descSize == newDesc->getLength()); + newDesc->computeChecksum(); + + fProxy = face->proxy()->createScalerContext(newDesc); + + fRec.getSingleMatrix(&fMatrix); + fMatrix.preScale(SK_Scalar1 / STD_SIZE, SK_Scalar1 / STD_SIZE); +} + +SkGScalerContext::~SkGScalerContext() { + SkDELETE(fProxy); +} + +unsigned SkGScalerContext::generateGlyphCount() { + return fProxy->getGlyphCount(); +} + +uint16_t SkGScalerContext::generateCharToGlyph(SkUnichar uni) { + return fProxy->charToGlyphID(uni); +} + +void SkGScalerContext::generateAdvance(SkGlyph* glyph) { + fProxy->getAdvance(glyph); + + SkVector advance; + fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX), + SkFixedToScalar(glyph->fAdvanceY), &advance); + glyph->fAdvanceX = SkScalarToFixed(advance.fX); + glyph->fAdvanceY = SkScalarToFixed(advance.fY); +} + +void SkGScalerContext::generateMetrics(SkGlyph* glyph) { + fProxy->getMetrics(glyph); + + SkVector advance; + fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX), + SkFixedToScalar(glyph->fAdvanceY), &advance); + glyph->fAdvanceX = SkScalarToFixed(advance.fX); + glyph->fAdvanceY = SkScalarToFixed(advance.fY); + + SkPath path; + fProxy->getPath(*glyph, &path); + path.transform(fMatrix); + + SkRect storage; + const SkPaint& paint = fFace->paint(); + const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(), + &storage, + SkPaint::kFill_Style); + SkIRect ibounds; + newBounds.roundOut(&ibounds); + glyph->fLeft = ibounds.fLeft; + glyph->fTop = ibounds.fTop; + glyph->fWidth = ibounds.width(); + glyph->fHeight = ibounds.height(); + glyph->fMaskFormat = SkMask::kARGB32_Format; +} + +void SkGScalerContext::generateImage(const SkGlyph& glyph) { + if (SkMask::kARGB32_Format == glyph.fMaskFormat) { + SkPath path; + fProxy->getPath(glyph, &path); + + SkBitmap bm; + bm.setConfig(SkBitmap::kARGB_8888_Config, glyph.fWidth, glyph.fHeight, + glyph.rowBytes()); + bm.setPixels(glyph.fImage); + bm.eraseColor(0); + + SkCanvas canvas(bm); + canvas.translate(-SkIntToScalar(glyph.fLeft), + -SkIntToScalar(glyph.fTop)); + canvas.concat(fMatrix); + canvas.drawPath(path, fFace->paint()); + } else { + fProxy->getImage(glyph); + } +} + +void SkGScalerContext::generatePath(const SkGlyph& glyph, SkPath* path) { + fProxy->getPath(glyph, path); + path->transform(fMatrix); +} + +void SkGScalerContext::generateFontMetrics(SkPaint::FontMetrics*, + SkPaint::FontMetrics* metrics) { + fProxy->getFontMetrics(metrics); + if (metrics) { + SkScalar scale = fMatrix.getScaleY(); + metrics->fTop = SkScalarMul(metrics->fTop, scale); + metrics->fAscent = SkScalarMul(metrics->fAscent, scale); + metrics->fDescent = SkScalarMul(metrics->fDescent, scale); + metrics->fBottom = SkScalarMul(metrics->fBottom, scale); + metrics->fLeading = SkScalarMul(metrics->fLeading, scale); + metrics->fAvgCharWidth = SkScalarMul(metrics->fAvgCharWidth, scale); + metrics->fXMin = SkScalarMul(metrics->fXMin, scale); + metrics->fXMax = SkScalarMul(metrics->fXMax, scale); + metrics->fXHeight = SkScalarMul(metrics->fXHeight, scale); + } +} + +/////////////////////////////////////////////////////////////////////////////// + +#include "SkTypefaceCache.h" + +SkGTypeface::SkGTypeface(SkTypeface* proxy, const SkPaint& paint) + : SkTypeface(proxy->style(), SkTypefaceCache::NewFontID(), false) + , fProxy(SkRef(proxy)) + , fPaint(paint) {} + +SkGTypeface::~SkGTypeface() { + fProxy->unref(); +} + +SkScalerContext* SkGTypeface::onCreateScalerContext( + const SkDescriptor* desc) const { + return SkNEW_ARGS(SkGScalerContext, (const_cast(this), desc)); +} + +void SkGTypeface::onFilterRec(SkScalerContextRec* rec) const { + fProxy->filterRec(rec); + rec->setHinting(SkPaint::kNo_Hinting); + rec->fMaskFormat = SkMask::kARGB32_Format; +} + +SkAdvancedTypefaceMetrics* SkGTypeface::onGetAdvancedTypefaceMetrics( + SkAdvancedTypefaceMetrics::PerGlyphInfo info, + const uint32_t* glyphIDs, + uint32_t glyphIDsCount) const { + return fProxy->getAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount); +} + +SkStream* SkGTypeface::onOpenStream(int* ttcIndex) const { + return fProxy->openStream(ttcIndex); +} + +void SkGTypeface::onGetFontDescriptor(SkFontDescriptor* desc, + bool* isLocal) const { + fProxy->getFontDescriptor(desc, isLocal); +} + +int SkGTypeface::onCharsToGlyphs(const void* chars, Encoding encoding, + uint16_t glyphs[], int glyphCount) const { + return fProxy->charsToGlyphs(chars, encoding, glyphs, glyphCount); +} + +int SkGTypeface::onCountGlyphs() const { + return fProxy->countGlyphs(); +} + +int SkGTypeface::onGetUPEM() const { + return fProxy->getUnitsPerEm(); +} + +SkTypeface::LocalizedStrings* SkGTypeface::onCreateFamilyNameIterator() const { + return fProxy->createFamilyNameIterator(); +} + +int SkGTypeface::onGetTableTags(SkFontTableTag tags[]) const { + return fProxy->getTableTags(tags); +} + +size_t SkGTypeface::onGetTableData(SkFontTableTag tag, size_t offset, + size_t length, void* data) const { + return fProxy->getTableData(tag, offset, length, data); +} + +/////////////////////////////////////////////////////////////////////////////// + +#if 0 +// under construction -- defining a font purely in terms of skia primitives +// ala an SVG-font. +class SkGFont : public SkRefCnt { +public: + virtual ~SkGFont(); + + int unicharToGlyph(SkUnichar) const; + + int countGlyphs() const { return fCount; } + + float getAdvance(int index) const { + SkASSERT((unsigned)index < (unsigned)fCount); + return fGlyphs[index].fAdvance; + } + + const SkPath& getPath(int index) const { + SkASSERT((unsigned)index < (unsigned)fCount); + return fGlyphs[index].fPath; + } + +private: + struct Glyph { + SkUnichar fUni; + float fAdvance; + SkPath fPath; + }; + int fCount; + Glyph* fGlyphs; + + friend class SkGFontBuilder; + SkGFont(int count, Glyph* array); +}; + +class SkGFontBuilder { +public: + +}; +#endif